Very high quality, cast-aluminum mounting rings that can be used for mounting telescope tubes on various mounts or on guidescope rails. All rings are hinged, felt-lined and have clamp-style rings for easy mounting or repositioning of the optical tube. The large clamp knob permits easy handling in all conditions, with or without gloves. The base of the rings has a standard 1/4"-20 thread for mounting on camera tripods, base plates, or other mounts. Gunmetal grey finish. Available in 2 sizes: 90mm and 136mm inner diameter.

If OD of the telescope is a little smaller than ID of the rings that you can shim the inside of rings with extra felt.